DOCSP-33168: Add missing sharding step (#6018)

* DOCSP-33168: Add missing sharding step

* rewording

* copy review

Author: norareidy

source/includes/steps-shard-existing-tsc.yaml

@@ -34,13 +34,13 @@ content: |
       ...
 
 ---
-title: Shard the collection.
-ref: new-sharded-tsc-create
+title: Create a hashed index on your collection.
+ref: new-sharded-tsc-index
 stepnum: 3
 level: 4
 content: |
-   Use the :method:`~sh.shardCollection()` method to shard the
-   collection.
+   Enable sharding on your collection by creating an index that supports
+   the :ref:`shard key <shard-key>`.
 
    Consider a time series collection with the following properties:
 
@@ -67,11 +67,28 @@ content: |
          "speed": 50
       } )
 
-   To shard the collection, run the following command:
+   Run the following command to create a hashed index on the
+   ``metadata.location`` field:
+
+   .. code-block:: javascript
+
+      db.deliverySensor.createIndex( { "metadata.location" : "hashed" } )
+
+---
+title: Shard your collection.
+ref: new-sharded-tsc-create
+stepnum: 4
+level: 4
+content: |
+   Use the :method:`~sh.shardCollection()` method to shard the
+   collection.
+
+   To shard the ``deliverySensor`` collection described in the preceding step, run
+   the following command:
 
    .. code-block:: javascript
 
-      sh.shardCollection( "test.deliverySensor", { "metadata.location": 1 } )
+      sh.shardCollection( "test.deliverySensor", { "metadata.location": "hashed" } )
 
    In this example, :method:`sh.shardCollection()`: